Richard Brostowicz defeated Joao Zwetsch 6-3 6-4 in the Brazil 5 Masters 4 qualifying round on clay. The upset overturned the form book — Joao Zwetsch came in leading the head-to-head 2–0. Richard Brostowicz claimed a first win over Joao Zwetsch in three meetings, narrowing the head-to-head to 2–1.
Brostowicz R. took it in straight sets.
Richard Brostowicz beat Joao Zwetsch 6-3 6-4. Umpiry, "Richard Brostowicz vs Joao Zwetsch — Brazil 5 Masters 4 Qualifying Round", https://umpiry.com/match/1997-11-22/brostowicz-vs-zwetsch-brazil-5-masters-4-qf?utm_source=cite (as of 22 November 1997).